package com.longge;

import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;

public class MaximumCount {


    public int dfs(int i, int j) {

        if (i > j) return 0;
        return i + dfs(i + 1, j);


    }

    public static void main(String[] args) {
        String a = null;
        String b = "a";
        System.out.println(b+a);
    }




}
